Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18370
Yeah, the original feature was for someone who wanted to override certain
configs locally; that makes sense (e.g. some user has a custom config with a
different replication factor than the cluster's), but it shouldn't overwrite
final configs. It's still possible to override final configs if the user really
wants to (e.g. by setting `spark.hadoop.*` in Spark's config).
> How large is that file (in KB/MB)?
The generated XML is about 100k (compared to about 10k for the XML files in
the config directory). It's not too horrible if you think about it. Maybe it's
better to go that route.
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